Can't see backups

I have WHM running daily backups of all domains. The backups are going to my second HDD mounted on /backup.

The backup log shows everything going fine, no error messages at all. But when I login as root and cd /backup, it's empty. There should be a cpbackup directory, and a daily dir under that with files for each domain.

It is enabled, since having it disabled seemed to prevent backups from working at all.

I tried the mount command, got no error messages, but still can't see anything in the dir.

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That is strange. I just tried it. I checked /backup it was empty. Went back to the root dir and typed mount /backup. I then checked /backup and now there is a directory cpbackup listed in the backup folder. However I then umount /backup from root, then cd /backup. Verified that it was showing empty again. Typed mount /backup again then did a long list commmand and it showed up empty... cd/ then cd /backup and the cpbackup is there again... strange...